It is tight bu twe are looking at a
AT85 MCU
FET + 1 + 7
1 7135 for lowest modes from moon and up to 350mA
then the extra 7 7135 kick in for regulated output of 2800mA (I estimate ittle over 1200 lumens out the front but a no expert )

At a guess, probably ~140 lm on the “1” channel, ~1000 lm on the “7+1” channels, and ~3000 lm on the FET channel. With smooth ramping from moon all the way to maximum. Or discrete levels if you prefer.

Anything up to 1000 lumens should be reasonably well-regulated.

I’m assuming I should (or someone should) probably put in some proper thermal regulation before the FW3A is released, but that probably won’t be too hard.

Putting in a blink at channel boundaries shouldn’t be hard either, but it depends on if that feature is desired.

At a guess, probably ~140 lm on the “1” channel, ~1000 lm on the “7+1” channels, and ~3000 lm on the FET channel. With smooth ramping from moon all the way to maximum. Or discrete levels if you prefer.

Anything up to 1000 lumens should be reasonably well-regulated.

I’m assuming I should (or someone should) probably put in some proper thermal regulation before the FW3A is released, but that probably won’t be too hard.

Putting in a blink at channel boundaries shouldn’t be hard either, but it depends on if that feature is desired.

If I absolutely had to choose between one, the D4 or this, what would you suggest? I mean, I will probably end up getting both to feed my crippling flashlight addiction, BUUUT, if I had to choose?

I’m assuming I should (or someone should) probably put in some proper thermal regulation before the FW3A is released, but that probably won’t be too hard.

Putting in a blink at channel boundaries shouldn’t be hard either, but it depends on if that feature is desired.

Yes agree after reading that you wrote the stepdown is more for bigger lights.
(Though it would be nice if you care to explain what is the difference, is it that smaller lights heat up faster so thermal stepdown should kick in sooner then actually measured?)

Is there enough memory space for an extra operation group?
now it is
1 ramping 2 modes, factory default 1
could that become
1 ramping smooth 2 ramping with blink at channel boundaries (same operation as 1) and 3 modes, factory default 2 (for in this small light with just one cell it is more important to know the regulated settings)

Yes agree after reading that you wrote the stepdown is more for bigger lights.
(Though it would be nice if you care to explain what is the difference, is it that smaller lights heat up faster so thermal stepdown should kick in sooner then actually measured?)

A light with a higher output-to-thermal-mass ratio needs more aggressive thermal regulation.

I think the method I came up with should work on both large and small lights, but I haven’t actually tried it on a larger light yet… so that’s still To Be Determined. The D4 now uses a predictive algorithm, so if the temperature is changing quickly it’ll react sooner than if the temperature is changing slowly. On a small light, which heats up faster, it’ll react faster — often before the temperature is anywhere near the limit. On a large light with slower heating, it’ll react slower. And the magnitude of response is proportional to the rate of change too, so a bigger light will be regulated in smaller steps.

For example, this is only an early simulation, but it shows how the light begins to step down (green line) before the measured temperature (Tdrv) even reaches the low end of the target zone (green shaded area):
The driver can guess where the temperature will be in the future, and it tries to steer away from that early.

On a larger or lower-powered light, the response would be slower and smoother and have a smaller initial bump.

The Miller wrote:

Is there enough memory space for an extra operation group?
now it is
1 ramping 2 modes, factory default 1
could that become
1 ramping smooth 2 ramping with blink at channel boundaries (same operation as 1) and 3 modes, factory default 2 (for in this small light with just one cell it is more important to know the regulated settings)

If I recall it correctly, there are several multi mode options, but a lot got the FET kicking in. I think all actually, nice with a big light and 1 7135 chip.
with 8 7135 chips and a small light a couple of options to choose from that keeps it in regulation longer could be good right?
Also like the idea of being ble to put it in a safe selection without it being possibleto use anything but the 7135.

If I recall it correctly, there are several multi mode options, but a lot got the FET kicking in. I think all actually, nice with a big light and 1 7135 chip.
with 8 7135 chips and a small light a couple of options to choose from that keeps it in regulation longer could be good right?
Also like the idea of being ble to put it in a safe selection without it being possibleto use anything but the 7135.

I would imagine it can have whatever mode groups you like. I’ll probably stick with ramping plus boundary blinks, for my personal use, but the mode group UI has tables for defining this stuff. It’s probably not hard to edit those tables.